(4-Aminobenzenesulfonato)heptaaquagadolinium(III) 4-aminobenzenesulfonate nitrate 4,4′-bipyridyl tetrasolvate dihydrate

In the title compound, [Gd(C6H6O3S)(H2O)7](C6H6O3S)(NO3)·4C10H8N2·2H2O, the GdIII ion is octacoordinated by seven water molecules and one O-bonded 4-aminobenzenesulfonate anion in a square-antiprismatic arrangement. In the crystal, the components are linked by N—H...O, O—H...N and O—H...O hydrogen bonds.